* {
  margin: 0;
  padding: 0;
}

body {
  width: 100vw;
  height: 100vh;
}

canvas {
  width: 100vw;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
}

.controls-box {
  position: fixed;
  bottom: 100px;
  left: 50%;
  transform: translate(-50%, 0);
  width: 100px;
  height: 100px;
  background-color: beige;
  z-index: 1;
}